Significant progress has also been made in the design of the filters themselves, the most important of which is the removal of dividers, that is, the development of non-baffle filters. The non-separator filter not only eliminates the danger of the partition plate damaging the filter medium, but also effectively increases the filtration area, improves the filtration efficiency, and reduces the airflow resistance, thus reducing the energy consumption. In addition, air filters have also made great progress in high temperature resistance, corrosion resistance, water resistance and bacteria resistance, meeting some special needs